The concept of microalgae cultivation as an integrated system in wastewater treatment has optimized the potential of the microalgae - based biofuel production. Microalgal biomass contains lipids polysaccharides proteins pigments and other cell compounds and it can provide different kinds of biofuels such as biodiesel biomethane and ethanol; these microorganisms can also be used to produce bioplastic materials and the residual biomass can be applied as fertilizer.